Zoe E Nerf?

As of the Morgana and Kayle rework and update. It seems as though a change to Zoe's E went undocumented. Prior to the patch, if a Morgana applied spell shield after the E already hit the person, the champion would still go to sleep. But now, if the spell shield is applied after, the champion doesn't fall asleep anymore. This change isn't seen anywhere in the patch notes or bugfixes. And this isn't a small change either. It's a matter of life or death that used to be dependent on a Morgana's reaction time to apply the spell shield. If anyone could point to where this is documented that would be helpful. But for now, it seems to be unfair to Zoe players that such a change wasn't clearly addressed.